Circulator Zoning - Primary/Secondary - Weil-McLain EcoTec 80 Manual

G -
®
ECO Tec
AS FIRED WATER BOILER
Primary/Secondary System piping
Circulator zoning –
(Shown with optional DHW piping)
See Figure 64.
1. This configuration is for circulator-zoned systems using a
boiler loop connected as a secondary circuit off of a primary
system loop. Systems zoned with circulators must pipe the
boiler loop as a secondary circuit as show.
2. Install a separate circulator (supplied by installer) for each zone
capable of delivering the proper flow and head as shown.
Expansion Tank required
1. Provide a system expansion tank following the guidelines
on page 50 or 51.
2. DO NOT use a closed-type tank if connecting to a water
heater that is equipped with an automatic vent.
Domestic Hot Water (DHW) tank, if used
1. DHW direct connection—Pipe from the near-boiler piping
to the DHW tank's boiler connections as shown.
2. DHW as zone— A DHW tank can be connected as a zone
if a DHW tank is NOT already connected to the boiler. See
notices on page 149 to ensure compliance with the 2007
Energy Act. See Control section in this manual, page 84 to
change TARGET MODULATION SENSOR to System Supply
when system sensors are installed.
3. DHW Priority operation— Using Priority 1 for DHW
(default) will turn off lower priorities during DHW calls. The
MAX ON TIME setting can be adjusted to limit how long
this occurs. Use Priority 2 or 3 for DHW if DHW priority
is not desired. For Combi models use INPUT2/PRIORITY
2 for the Indirect DHW systems.
Overriding the Outdoor Reset function by setting
control to DHW mode when system is intended
for space heating may violate Section 303 of the
2007 Energy Act. See page 149 for compliance
information and exemptions.
Controlling the circulators
1. The Control, for Heat only models, can control up to five
circulators (boiler circulator and four others.) For Combi
models, the control can control up to three circulators (boiler
circulator and two others.) Refer to Field wiring, beginning
on page 58, for instructions on wiring to circulators.
2. The factory default settings are not configured. Each input
correlates to its respective circulator output. For DHW
1 ECO Tec boiler
2 Indirect Water Heater, if used
3 Relief valve, supplied with boiler, field piped — MUST
be piped to Boiler In connection — see page 13 for
information
4 Relief valve piping to drain — see page 51
5 DHW circulator
6 Isolation valves
7 System circulator
8 Expansion tank, diaphragm type, if used
9 Air separator
10 Spring check valves
11 Purge/drain valves
(one drain valve shipped loose with boiler)
54
–
primary/secondary
.
12 Auto air vent
13 Zone valves
14 Primary/secondary connection (tees no more than 12
inches apart)
15 Expansion tank, closed type, if used (some chiller
systems may use a diaphragm-type expansion tank)
16 Water chiller
17 Check valve
18 Y-strainer
19 Balancing valve
20 Make-up water supply – Use applicable codes to
determine if backflow preventers, pressure reducing
valves, and fill valves may be required
B
80/110/150/199
Circulator zoning plus optional DHW piping
Priority applications, wire aquastat to Input 1 and assign to Priority
1. See Field wiring instructions, beginning on page 58, for details.
For Combi models use INPUT2/PRIORITY 2 for the Indirect
DHW systems.
3. For more than 4-zones (Heat only models) or 2-zones (Combi
only models), use an external zone controller.
This is a common legend for all piping diagrams.
Not all Items listed appear in every figure.
21 By-pass pressure regulator, REQUIRED for zone valve
22 High limit temperature control (If used)
23 DHW tank boiler water supply connection, when used
24 Zone circulator
25 DHW tank boiler water return connection, when used
26 Pressure/temperature gauge, supplied with boiler, field
27 Heating circuits
28 Additional heating circuits, if any
M
OILER ANUAL
(continued)
systems unless other provision is made
piped
Part number 550-100-260/0520